WO2023166600A1 - Dispositif d'antenne, terminal sans fil et module sans fil - Google Patents

Dispositif d'antenne, terminal sans fil et module sans fil Download PDF

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Publication number
WO2023166600A1
WO2023166600A1 PCT/JP2022/008818 JP2022008818W WO2023166600A1 WO 2023166600 A1 WO2023166600 A1 WO 2023166600A1 JP 2022008818 W JP2022008818 W JP 2022008818W WO 2023166600 A1 WO2023166600 A1 WO 2023166600A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna device
ground
opening
radiating element
radiation
Prior art date
Application number
PCT/JP2022/008818
Other languages
English (en)
Japanese (ja)
Inventor
貴裕 篠島
洋平 古賀
学 吉川
Original Assignee
Ｆｃｎｔ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｆｃｎｔ株式会社 filed Critical Ｆｃｎｔ株式会社
Priority to JP2022546491A priority Critical patent/JP7159512B1/ja
Priority to PCT/JP2022/008818 priority patent/WO2023166600A1/fr
Priority to US18/133,074 priority patent/US11901650B2/en
Publication of WO2023166600A1 publication Critical patent/WO2023166600A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/185—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces wherein the surfaces are plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/005—Patch antenna using one or more coplanar parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path

Definitions

  • the present invention relates to an antenna device, a wireless terminal and a wireless module.
  • Microstrip antennas are often used for millimeter wave band antennas.
  • a rectangular microstrip antenna it is possible to control the direction of radio waves by supplying power in consideration of polarization.
  • radio waves in the millimeter wave band have a relatively strong tendency to interfere with each other to strengthen or weaken the waves
  • the use of an array antenna in which planar radiation elements are arranged vertically and horizontally will improve the directivity of the entire antenna. It is possible to strengthen the characteristics and widen the radiation angle.
  • a small wireless terminal that can be carried by a user, it is not easy to secure a space for arranging the radiating elements vertically and horizontally within the housing.
  • One aspect of the disclosed technology aims to provide an antenna device, a wireless terminal, and a wireless module in which the directivity of a planar radiation element is enhanced.
  • antenna device a planar radiating element; a feeding point connected to the radiating element; a ground portion for placing the radiating element in the opening of the conductive material; the opening has an opening shape that gradually widens in the radial direction of the radiation surface of the radiation element; antenna device.
  • the directivity of the planar radiation element can be enhanced.
  • FIG. 1 is an external perspective view of an antenna device according to an embodiment.
  • FIG. 2 is a diagram showing the internal structure of the antenna device according to the embodiment.
  • FIG. 3 is a perspective view of the antenna device according to the embodiment in which illustration of resin is omitted.
  • FIG. 4 is a diagram showing the internal structure of an antenna device according to a comparative example.
  • FIG. 5 is a perspective view of an antenna device according to a comparative example in which illustration of resin is omitted.
  • FIG. 6 is a first diagram showing simulation results.
  • FIG. 7 is a second diagram showing simulation results.
  • FIG. 8 is a third diagram showing simulation results.
  • FIG. 9 is a fourth diagram showing simulation results.
  • FIG. 10 is a diagram showing the internal structure of an antenna device according to a modification.
  • FIG. 10 is a diagram showing the internal structure of an antenna device according to a modification.
  • FIG. 11 is a perspective view of an antenna device according to a modification in which illustration of resin is omitted.
  • FIG. 12 is a fifth diagram showing simulation results.
  • FIG. 13 is a graph showing simulation results of the relationship between the widening degree of the ground opening and the peak gain.
  • FIG. 14 is a graph showing a simulation result of the relationship between the number of ground pattern layers and the peak gain.
  • FIG. 15 is a diagram showing a metal processed body in which ground openings are formed in a metal plate.
  • FIG. 16 is a diagram illustrating an example of a smart phone;
  • FIG. 17 is a diagram showing an example of a wireless module.
  • the antenna device has, for example, the following configuration. That is, the antenna device includes a planar radiating element, a feeding point connected to the radiating element, and a ground portion for placing the radiating element in an opening made of a conductive material. It has an opening shape that gradually widens the opening width in the radial direction.
  • the directivity of the planar radiation element can be enhanced.
  • the antenna device can be mounted in, for example, a wireless terminal.
  • wireless terminals include smartphones, tablet terminals, wearable computers, mobile phones, notebook personal computers, and the like.
  • FIG. 1 is an external perspective view of an antenna device according to an embodiment. Although FIG. 1 illustrates a main part of the overall rectangular shape in order to show the appearance of the antenna device 1, the antenna device 1 is not limited to a form exhibiting such an appearance.
  • the antenna device 1 may be part of a wiring board of an electronic circuit that controls various processes, or may be part of another member.
  • the wiring board may be a hard rigid board or a bendable flexible board.
  • the antenna device 1 includes a substrate ground 2, a resin 3 laminated on the substrate ground 2, a ground portion 4 formed by ground patterns 4A to 4E laminated on the resin 3, and an opening-shaped non-ground formed in the ground pattern 4A. It comprises a ground opening 5 formed in the ground portion 4 by a portion 4AH or the like.
  • FIG. 2 is a diagram showing the internal structure of the antenna device 1 according to the embodiment. Also, FIG. 3 is a perspective view of the antenna device 1 according to the embodiment in which illustration of the resin 3 is omitted. FIG. 2 shows a front view of the appearance of the antenna device 1, and a cross-sectional view of the antenna device 1 taken along the line AA in FIG.
  • the ground patterns 4A to 4E are laminated in the resin 3 while being spaced apart from each other.
  • a planar radiation element 6 is also formed in the non-ground portion 4EH of the ground pattern 4E.
  • the antenna device 1 is in the form of a multilayer substrate in which a layer of a conductive material is laminated on the dielectric resin 3 .
  • the layer of conductive material includes, for example, a layer of copper foil. Each layer of conductive material is electrically connected to the ground portion of the substrate ground 2 and has the same potential as the ground.
  • the radiating element 6 is a radiating element formed in a square (patch shape) when the antenna device 1 is viewed from the front.
  • the radiating element 6 is connected to the high frequency circuit of the substrate ground 2 via the feeding point 7 .
  • the antenna device 1 is a dual-polarized antenna in which two feeding points 7 are provided on the radiating element 6 .
  • the radiating element 6 emits radio waves in the millimeter wave band fed from the high-frequency circuit of the substrate ground 2 via the feeding point 7 and receives radio waves transmitted from the outside.
  • the feeding point 7 may be provided with an appropriate matching circuit.
  • a suitable high-pass filter or band-pass filter may be employed in the high-frequency circuit of the board ground 2 .
  • the radiating element 6 has lengths in the vertical and horizontal directions so that it resonates at the wavelength ⁇ of the radio wave of the design frequency for transmission and reception by the antenna device 1 . That is, the vertical and horizontal dimensions of the radiating element 6 are a positive integral multiple of ⁇ /2, taking into consideration the wavelength shortening due to the dielectric constant of the resin 3 .
  • the antenna device 1 of the present embodiment has a radiating element 6 in the ground opening 5 formed by the non-ground portions 4AH to 4EH of the ground patterns 4A to 4E of the ground portion 4. It has a form of internal placement.
  • the ground opening 5 gradually expands as the non-ground portions 4AH to 4EH of the ground patterns 4A to 4E of the ground portion 4 shift to layers in the radiation direction of the radiation surface of the radiation element 6. It has an opening shape that gradually widens the opening width toward.
  • the ground opening 5 has an opening shape that widens symmetrically across a virtual central axis passing through the center of the square radiation surface of the radiation element 6 .
  • the ground opening 5 Since each of the non-ground portions 4AH to 4EH is square, the ground opening 5 has a square opening shape when viewed from the whole. For this reason, the ground opening 5 has a form similar to a part of an inverted quadrangular pyramid as seen from the back side of the bottom of the quadrangular pyramid. Alternatively, the ground opening 5 can be regarded as an opening with a tapered or stepped edge.
  • the ground opening 5 of the ground portion 4 in which the radiating element 6 is placed has an opening shape in which the opening width gradually widens in the radial direction of the radiation surface of the radiating element 6. Therefore, the directivity of the planar radiation element 6 can be enhanced. Since the effect of the opening shape of the ground opening 5 was verified by an electromagnetic field simulator, the details of the verification will be described below.
  • FIG. 4 is a diagram showing the internal structure of an antenna device according to a comparative example.
  • FIG. 5 is a perspective view of the antenna device 101 according to the comparative example in which illustration of the resin is omitted.
  • FIG. 4 shows a front view of the appearance of the antenna device 101, and a cross-sectional view of the antenna device 101 taken along the line BB in FIG.
  • the same reference numerals are assigned to the same components as those of the antenna device 1 according to the embodiment, and the description thereof will be omitted.
  • the radiating element 6 is placed in the ground opening 105 formed by the ground portions 104AH to 4EH of the ground portions 104A to 4E of the ground portion 104. form.
  • the ground portions 104AH to 4EH of the ground portions 104A to 4E of the ground portion 104 have the same size. Therefore, unlike the ground opening 5 of the embodiment, the ground opening 105 of the comparative example does not have an opening shape in which the opening width gradually widens in the radial direction of the radiation surface of the radiation element 6. The opening width is constant in the radial direction of the radiation surface of the element 6 .
  • FIG. 6 is the first diagram showing the simulation results.
  • the X-axis direction corresponds to the horizontal direction in the front views shown in FIGS. 2 and 4
  • the Y-axis direction corresponds to the vertical direction in the front views shown in FIGS. corresponds to the direction orthogonal to the paper surface in the front view shown in FIG. Therefore, in FIG. 6, the arrow direction of the Z-axis corresponds to the radiation direction of the radiation surface of the radiation element 6,106.
  • the shading display of the gray scale in FIG. 6 indicates the gain of the antenna, and the portions with high gain are shown in dark gray.
  • the antenna device 1 of the embodiment has a gain of 6.8 dBi in the Z-axis direction.
  • the antenna device 101 of the comparative example has a gain of 5.0 dBi in the Z-axis direction. That is, the gain in the Z-axis direction of the antenna device 1 of the embodiment is 1.8 dB higher than that of the antenna device 101 of the comparative example. Therefore, it can be said that the antenna device 1 of the embodiment has higher directivity of the radiating element 6 than the antenna device 101 of the comparative example.
  • FIG. 7 is a second diagram showing simulation results.
  • FIG. 8 is a third diagram showing simulation results.
  • FIG. 9 is a fourth diagram showing simulation results. More specifically, FIG. 7 shows a contour diagram showing the electric field strength distribution in the case where the antenna device 1 of the embodiment is cut along the AA cross section, and the antenna device 101 of the comparative example is shown in the BB cross section. The contour map showing the distribution of the electric field strength in the case of cutting with contour lines is also shown side by side. 8 is an enlarged view of the vicinity of the edge of the ground opening 5 in the contour map of the embodiment shown in FIG. is shown. Also, in FIG. 9, an enlarged view of the vicinity of the edge of the ground opening 105 in the contour diagram of the comparative example shown in FIG. showing.
  • the electric field strength in the radial direction is stronger in the embodiment than in the comparative example.
  • the enlarged view of FIG. 7 there is a large difference in the distribution of the electric field intensity near the edges of the ground openings 5 and 105 . That is, when comparing the enlarged view of the embodiment and the enlarged view of the comparative example in FIG. is lower in the embodiment than in the comparative example. In other words, in the vicinity of the edges of the ground openings 5 and 105, the electric field is more attracted to the ground pattern in the comparative example than in the embodiment. As can be seen from FIG.
  • the edges of the non-ground portions 4AH to 4EH form the edge of the ground opening 5 in a stepped manner. This is probably because the ground portion 4 has a weak component (force as a ground), and the effect of the ground portion 4 that weakens the component in the radial direction is small.
  • the edges of the ground portions 104AH to 104EH do not form the edge of the ground opening portion 105 in a stepped manner. This is probably because the ground portion 104, which has a strong component (force as a ground) and weakens the component in the radial direction, does not have a small effect.
  • the feedback of radiated power to the ground portion is reduced as compared with the antenna device 101 of the comparative example. That is, it is considered that the power radiated toward the front of the radiating element 6 is strengthened, and the peak gain in the radiation direction is improved.
  • FIG. 10 is a diagram showing the internal structure of an antenna device according to a modification. Also, FIG. 11 is a perspective view of the antenna device 11 according to a modification in which illustration of resin is omitted.
  • FIG. 10 shows a front view of the appearance of the antenna device 11, and a cross-sectional view of the antenna device 11 taken along the line CC in FIG.
  • the same components as those of the antenna device 1 according to the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
  • the radiation element 16 of the antenna device 11 is formed by stacking two square plates of conductive material with a non-conductive resin interposed therebetween. It is a radiating element with a stack structure. Of the two plate-shaped conductive materials forming the radiation element 16, the one closer to the substrate ground 2 is a radiation element to which the feeding point 7 is connected, and the one farther from the substrate ground 2 is connected to the feeding point 7. It is a parasitic radiating element that does not Such a radiating element 16 can achieve a wider band or higher gain than the radiating element 6 of the antenna device 1 according to the above-described embodiment.
  • FIG. 12 is a fifth diagram showing simulation results.
  • the antenna device 11 of this modified example has a gain of 7.2 dBi in the Z-axis direction.
  • the antenna device 101 of the comparative example has a gain of 5.0 dBi in the Z-axis direction as described above. That is, the gain in the Z-axis direction of the antenna device 11 of this modified example is 2.2 dB higher than that of the antenna device 101 of the comparative example. Therefore, it can be said that the antenna device 11 of the modified example has higher directivity of the radiating element 16 than the antenna device 101 of the comparative example.
  • FIG. 13 is a graph showing simulation results of the relationship between the widening degree of the ground opening 5 and the peak gain.
  • the horizontal axis in FIG. 13 represents the dimension indicated by the symbol Lo in FIG. 2 by the length W of one piece of the radiating element.
  • Other conditions are as described in the section ⁇ Simulation conditions> above.
  • the peak gain is 5.6dBi to 5.9dBi when Lo is between 1.1W and 1.5W.
  • the measurement error of the measuring instrument for measuring the electric field strength of the actual device is about 0.8 dB
  • the directivity of the antenna device 1 according to the present embodiment is It can be seen that the effect of improving the Also, the peak gain is 5.7dBi to 5.8dBi when Lo is between 4.0W and 4.5W. Therefore, even when Lo is between 4.0W and 4.5W, the effect of improving the directivity in the antenna device 1 according to the present embodiment is weak.
  • the antenna device 1 of the present embodiment complies with the following design conditions, directivity can be improved by setting the length Lo of one side of the non-ground portion 4AH to any value between 2.0 W and 3.5 W. It can be said that the effect is exhibited more sufficiently. This is because if the width of the ground opening 5 expanding in the radial direction is weak and the non-ground portion 4AH is narrow, the radiation is blocked.
  • FIG. 14 is a graph showing a simulation result of the relationship between the number of ground pattern layers and the peak gain. Conditions other than the number of layers of the ground pattern are as described in the section ⁇ Simulation conditions> above.
  • the peak gain improves as the number of layers of the ground pattern increases.
  • the number of ground pattern layers reaches about 10
  • the effect of improving the gain is saturated. Therefore, when the antenna device 1 of this embodiment complies with the following design conditions, it can be said that the rational range for the number of layers of the ground pattern is up to 10.
  • the antenna device 1 and the antenna device 11 can be modified as appropriate.
  • the radiating element 6 may be circular, elliptical, triangular, polygonal with pentagons or more.
  • the ground opening 5 has a shape corresponding to the shape of the radiating element 6 .
  • the ground opening 5 is widened so that all four sides of the square edge are equally long, but it is not limited to this.
  • the ground opening 5 may have a configuration in which only one to three of its four sides are widened in the radial direction.
  • the antenna device 1 and the antenna device 11 may be arranged not only as a single unit, but also vertically and horizontally, for example.
  • An array antenna in which the antenna device 1 and the antenna device 11 are arranged vertically and horizontally can realize an antenna with higher directivity.
  • the ground opening 5 may be formed in a thick metal plate, for example.
  • FIG. 15 is a view showing a metal processed body 8 in which ground openings 15 are formed in a metal plate. Even if the ground opening 15 is formed in the metal plate, the directivity of the planar feeding point 7 can be enhanced as in the above-described embodiment and modification. Further, in the case of the ground opening 15 formed in a metal plate, not only is the opening width gradually widened in the radial direction by making the edge portion stepped, but also, for example, the edge portion is formed as an inclined surface. By doing so, it is also possible to realize a form in which the opening width is gradually widened in the radial direction.
  • FIG. 16 is a diagram illustrating an example of a smart phone;
  • the antenna device 1 of the above embodiment may be incorporated in a smart phone 21, which is a type of wireless terminal. If the antenna device 1 is applied to the smartphone 21, the smartphone 21 can perform high-speed wireless communication using the antenna device 1 with high directivity.
  • FIG. 17 is a diagram showing an example of a wireless module.
  • FIG. 17 illustrates a wireless module 31 in which four antenna devices 1 of the above embodiment, which are patch antennas, are arranged in the vertical direction.
  • the illustration of the resin 3 is omitted as in FIG.
  • the antenna device 1 of the above-described embodiment can be arranged in a plurality in a vertical direction, a horizontal direction, or a combination thereof, so that the directivity can be further improved.
  • the communication device can perform high-speed wireless communication using an antenna with higher directivity.

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Abstract

L'invention concerne un dispositif d'antenne, un terminal sans fil et un module sans fil dans lesquels la directivité d'un élément rayonnant plan est améliorée. Le dispositif d'antenne comprend l'élément rayonnant plan, un point d'alimentation connecté à l'élément rayonnant et une masse pour placer l'élément rayonnant dans une ouverture d'un matériau conducteur, l'ouverture ayant une forme d'ouverture de telle sorte que la largeur d'ouverture augmente progressivement dans la direction de rayonnement de la surface rayonnante de l'élément rayonnant.
PCT/JP2022/008818 2022-03-02 2022-03-02 Dispositif d'antenne, terminal sans fil et module sans fil WO2023166600A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2022546491A JP7159512B1 (ja) 2022-03-02 2022-03-02 アンテナ装置、無線端末及び無線モジュール
PCT/JP2022/008818 WO2023166600A1 (fr) 2022-03-02 2022-03-02 Dispositif d'antenne, terminal sans fil et module sans fil
US18/133,074 US11901650B2 (en) 2022-03-02 2023-04-11 Antenna device, wireless terminal, and wireless module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/008818 WO2023166600A1 (fr) 2022-03-02 2022-03-02 Dispositif d'antenne, terminal sans fil et module sans fil

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/133,074 Continuation US11901650B2 (en) 2022-03-02 2023-04-11 Antenna device, wireless terminal, and wireless module

Publications (1)

Publication Number Publication Date
WO2023166600A1 true WO2023166600A1 (fr) 2023-09-07

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JP (1) JP7159512B1 (fr)
WO (1) WO2023166600A1 (fr)

Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2006262218A (ja) * 2005-03-18 2006-09-28 Eudyna Devices Inc アンテナ基板、電子回路パッケージおよび通信装置
JP2009081833A (ja) * 2007-09-07 2009-04-16 Sharp Corp 無線通信装置
JP2009206781A (ja) * 2008-02-27 2009-09-10 Nippon Telegr & Teleph Corp <Ntt> アンテナ装置

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Publication number Priority date Publication date Assignee Title
JP2921246B2 (ja) 1992-03-13 1999-07-19 三菱電機株式会社 アンテナ装置
US7852270B2 (en) 2007-09-07 2010-12-14 Sharp Kabushiki Kaisha Wireless communication device
JP2014096742A (ja) 2012-11-12 2014-05-22 Mitsubishi Electric Corp アレーアンテナ装置及びアレーアンテナ装置の製造方法
CN113728515A (zh) * 2019-04-24 2021-11-30 株式会社村田制作所 天线模块和搭载有该天线模块的通信装置
CN117293530A (zh) * 2019-09-27 2023-12-26 株式会社村田制作所 天线模块和搭载该天线模块的通信装置以及电路基板
US11329381B2 (en) * 2019-12-31 2022-05-10 Samsung Electronics Co.. Ltd. Dual-band antenna using coupled feeding and electronic device comprising the same

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2006262218A (ja) * 2005-03-18 2006-09-28 Eudyna Devices Inc アンテナ基板、電子回路パッケージおよび通信装置
JP2009081833A (ja) * 2007-09-07 2009-04-16 Sharp Corp 無線通信装置
JP2009206781A (ja) * 2008-02-27 2009-09-10 Nippon Telegr & Teleph Corp <Ntt> アンテナ装置

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JP7159512B1 (ja) 2022-10-24
JPWO2023166600A1 (fr) 2023-09-07
US20230282981A1 (en) 2023-09-07
US11901650B2 (en) 2024-02-13

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